Lamp harp extension



Sept. 1, 1953 P CHlLO 2,650,981

LAMP HARP EXTENSION Filed Jan. 18, 1950 Patented Sept. 1, 1953 UNITED STATES PATENT OFFICE LAMP HARP EXTENSION Paul Chilo, Chicago, Ill.

Application January 18, 1950, Serial No. 139,169

(Cl. B4G- 148) 3 Claims. 1

The invention relates generally to lamp structures. and more particularly to an extension member for lamp harps.

The invention has among its objects the production of an extension for use with electric lamp structures to provide an adjustment of a lamp shade with respect to the lamp harp and base, which extension is attractive in appearance, simple in construction, and inexpensive to manufacture.

Another object of the invention is the productionv of such an extension by means of which adjustments over a relatively wide range may be accomplished, at the same time providing adequate support for the lamp shade in any position of adjustment.

A further object of the invention is the production of such an extension member which is designed for rigid connection with a like member whereby a plurality of such members may be employed as a composite extension.

The invention is of particular use in facilitating the use of a large replacement lamp shade on a lparticular lamp base which would otherwise be small for such larger shade.

Many other objects and advantages of the construction herein shown and described will be obvious tothose skilled in the art from the disclosure herein given.

To this end my invention consists in the novel construction, arrangement and combination of -parts herein shown and described, and more particularly pointed out in the claims.

In the drawings, wherein like reference characters represent like or corresponding parts:

Fig. l is a perspective view of a harp extension embodying the present invention;

Fig. 2 is a vertical, sectional View of such an extension, with a similar extension connected thereto, portions of the later being broken away;

Fig. 3 is a sectional view taken approximately on the line 3-3 of Fig. 2;

Fig. 4 illustrates a lamp base and shade before the application of an extension thereto;

' Fig. 5 is a figure similar to Fig. 4 illustrating the use of a single extension; and

Fig. 6 is a figure similar to Fig. 4 illustrating -the use of a plurality of extension members.

Referring to the drawings, and more particularly Figs. 1 to 3, I indicates an extension member comprising a hollow body 2 formed from relatively light gauge sheet material, or the like, formed by stamping, spinning, drawing, or other suitable operation, into a cup-shaped structure having a cylindrical side wall 3, and a bottom wall, indicated generally by the numeral 4. As

illustrated in Figs. 2 and 3, the bottom 4 is provided with a generally cylindrical recess 5 axially aligned with the axis of the body 2, with the bottom wall 6 of the recess being provided with an internally threaded bore l. The open end 8 of the body 2 is closed by a cap member 9 rigidly secured to the body 2, and in the embodiment of the invention illustrated, the upper peripheral portion of the body adjacent the open end 8 is flared peripherally outwardly to form a slight bead II over which the cap member 9 is crimped or spun, as indicated at I2. The central portion i3 of the cap member 9 is offset outwardly with respect to the peripheral portions of the latter, as indicated at I4, and formed in the central portion I3 is a bore I5, in which is positioned the lower end I6 of a stud I'I, the latter having an externally threaded portion I8 adjacent its upper end, with the lower portion I 6 and threaded portion I8 being separated by an annular flange I9 bearing against the adjacent surface of the central portion I3 of the cap. The bore I5 and portion I6 of the stud Il are of a relative size to achieve a press t between the portion I6 and the side walls of the bore I5, thereby rigidly securing the stud I1 to the cap 9, the axis of the stud I'I being aligned with the axis of the bore Lamp shades such as the shade S diagrammatically illustrated in Fig. 4 are normally connected to a lamp base B by means of aharp H, the top portion of which carries a suitable fitting,

indicated generally by the letter F. As is wellv known in the art, such fittings normally are provided with a stud corresponding to the stud IY'I adapted to be encircled by a portion of the lamp frame assembly, which is held in position by an ornamental knob A, or the like, threaded on the stud carried by such fitting. A standard sized stud is normally employed in such fittings, and the stud I'I is constructed of the same size and with the same number of threads as the stud on the usual lamp harp fitting. Likewise, the threaded bore l' in the bottom of the extension is of a size and provided with like internal threads to receive the standard stud. Thus, as illustrated in Fig. 2, the stud Il of a similar extension member I may be readily screwed into the threaded bore I of the extension oftentimes it is desired to replace the shade of a lamp with another shade which is larger than the original shade designed for use with the particular lamp base; as a result of which the larger lamp shade is not positioned properly with respect to the lamp base, and consequently does not impart a pleasing appearance or hides Va portion of the lamp base, an example of such condition being illustrated in Fig. 4, wherein the shade S extends down and partially hides the upper portion of the lamp base. The correct position of the lamp shade shown in Fig. 4 is illustrated in Fig. 5, in which the shade has been elevated with respect to the base to reveal the top portion of the latter. Such elevation of the lamp shade is readily accomplished by adding an extension member, such as illustrated in Fig. l, screwing the extension down on lthe stud carried by the lamp harp, following which the supporting structure of the lamp shade is placed on the stud I'I, and the original knob A engaged -with the stud.

If a still larger or higher shade is tofbe utilized, as for example, the. shade S in Fig.- 6,

proper positioning of the shade with respect tov the lamp base may be accomplished by fusi-ng a plurality of extension members, the use of three ,such members being illustrated in Fig. 6, with the respective members I being secured to one another, as illustrated in Fig. 2, the lower-most extension member being engaged with the stud on :the fitting F of the harp., and the knob A being engaged with the stud I7 of the uppermost ex- Atension member, with the latter directly supporting the shade S.

1t will be noted that the recess 5 in the bottom of each member is of a size to receive the annular .flange I9 of alike member or a similar -flange carried by the stud on the harp fitting, with the annular-shaped surface of the bottom 4 engaging the surface of the central portion I3 of having an axial bore therein, a stud, and an annular ilange formed on said stud intermediate its ends, the portion of said stud at one side of said flange being provided with external threads. said threaded portion being substantially the same diameter and having the same number of threads per inch as said threaded bore, the opposite end portion of said stud being positioned in the bore in said oppositezend andengagng the`s'l`de walls thereof in a press fit whereby the stud and body member are rigidly secured together, with the flange on said stud being smaller in diameter than that of the recess in said bottom wall of the body member, and less in thickness than the depth of suchxrecess, said flange being seated on the bodir member.

2. An extension for use with a lamp harp having a shade mounting stud extending therefrom .the member positioned therebelow. Likewise, the

composite structure that is very rigid. The num- .ber of extension members employed in any given case Will, of course, depend upon the desired elevation required in any particular application.

It will .be .noted from the above description that Ithe extension member may be readily and inexpensively manufactured by a relatively simple process to produce a very efficient and durable dev-ice which is pleasing in appearance, and harmonizes with the usual lamp harp structures. Likewise, 'that Ihave provided an extension member which is so .constructed that a series of such members may be employed as a single rigid unit.

Having thus described my invention, it is obvious that various immaterial modifications may be made in the same without departing from the :spirit of my invention; hence, I do not Awish to Abe understood as limiting myself to the exact form, construction, arrangement, and combination of parts herein shown and described or uses mentioned.

What I claim as new and desire to secure by Letters Patent is:

1. An extension for use with a lamp `harp having a shade mounting stud extending therefrom -comprising a cylindrical body member, the botharp stud, the central portion of the opposite end ,of said body member being oiset outwardly and comprising a hollow body member open at one end 4and having cylindrical side Walls and bottom end wall, the latter being provided with an axially aligned recess therein, the bottom wall of said recess having an axially aligned, internally threaded bore therein of a size to receive a lamp harp stud, a cap secured to and closing the open end of said body member, said cap member having an Aaxial bore therein, a stud, and an annular flange formed on said stud intermediate its ends, the portion of said stud at one side of said ange being provided with external threads, said threaded portion being substantially the same diameter and having the same number of V.threads per inch as said threaded bore, the opposite end portion of said stud being rigidly secured to said cap, with the flange on said 4stud being smaller in diameter than that of the recess in'said bottom wall of the body member, and less in thick.- ness than the depth of such recess, said flange being seated on the adjacent external surface of said cap.

3. An extension for use with a lamp harp having a shade mounting stud extending therefrom comprising a hollow body member open at .one end and having cylindrical -side walls and bottorn end wall, the latter being provided with an axially aligned recess therein, the bottom wall o f said recess having an axially aligned, internally threaded bore therein of a size to receive a lamp harp stud, a cap closing the open end of said body member, the side wall of the latter at said open end being provided with an external, peripheral bead, saidcap member having a pe'- ripheral flange thereon engaged with said bead to rigidly connect the body member and cap to one another, the central portion of said cap member being offset outwardly and having an axial .bore therein, a stud, and an annular flange formed .on said stud intermediate its ends, the portion of said stud at one side of said flange be ing provided with vexternal threads, said threaded portion being substantially the same diameter ,andhaving the samenumber Aof threads per inch as said threaded bore, the opposite end portion ,of said stud being positioned in the bore in said cap and engaging the side walls thereof in a press lit whereby the stud and cap are rigidly secured together, with the ilange von said stud being .smaller in diameter than that of the recess in ,said bottom wall of the body member, and less in thickness than the depth of such recess, said lange being seated on the adjacent external surface of said cap.

VPAUL CHILO.

(Referenceson following page) l References Cited in the fle of this patent UNITED STATES PATENTS Number Number Name Date Lieb Feb. 24, 1891 Hayward Jan. 10, 1905 Chadwick Jan. 17, 1928 Shapiro May 13, 1930 FOREIGN PATENTS Country Date Great Britain Apr. 17, 1928 OTHER REFERENCES W. N. de Sheribin Adapters, Inc., price list, J an. 1, 1940, page 2, item #5501. Lamp Parts.

Allied Radio Corp. Catalog 1932, page 29, item #B6304, photostat in 48/12.

Chicago Screw Co. Catalog No. 340, received May 27, 1948, page 29, item #90. Lamp Parts. 

